Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Comparator Multi-purpose CMOS, Rail-to-rail, TTL SOIC 8 N

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General Description

The MAX975/MAX977 single/dual comparators feature

three different operating modes, and are optimized for

+3V and +5V single-supply applications. The operating

modes are as follows: high speed, high speed with

auto-standby, and low power. Propagation delay is 28ns

in high-speed mode, while supply current is only 250µA.

Supply current is reduced to 3µA in low-power mode.

The auto-standby feature allows the comparator to

automatically change from low-power mode to high-

speed mode upon receipt of an input signal. In the

absence of an input signal, the comparator reverts

back to low-power mode after an adjustable timeout

period. The timeout period for the MAX975 to enter

standby is set by a single capacitor. The dual MAX977

features independently adjustable timeout periods for

each comparator using separate capacitors.

The MAX975/MAX977’s inputs have a common-mode

voltage range of -0.2V to (V

- 1.2V). The differential

input voltage range extends rail to rail. The outputs are

capable of rail-to-rail operation without external pull-up

circuitry, making these devices ideal for interface with

CMOS/TTL logic. All inputs and outputs can tolerate a

continuous short-circuit fault condition to either rail. The

comparator’s internal hysteresis in high-speed mode

ensures clean output switching, even with slow-moving

input signals.

The single MAX975 is available in 8-pin SO and 8-pin

µMAX

packages, while the dual MAX977 is available

in 14-pin SO and 16-pin QSOP packages.

________________________Applications

Battery-Powered Systems

RF ID Tags

Keyless Entry

Threshold Detectors/Discriminators

3V Systems

IR Receivers

Digital-Line Receivers

____________________________Features

♦♦

Three Operating Modes:

High Speed

High Speed with Auto-Standby

Low Power

♦♦

28ns Propagation Delay (high-speed mode)

♦♦

5µA Max Supply Current in Low-Power/

Auto-Standby Modes

♦♦

+3V/+5V Single-Supply Operation

♦♦

Rail-to-Rail Outputs

♦♦

Ground-Sensing Input

♦♦

Internal Hysteresis (high-speed mode)

♦♦

Adjustable Timeout Period

♦♦

µMAX Package (MAX975)

QSOP-16 Package (MAX977)

MAX975/MAX977

Single/Dual, +3V/+5V Dual-Speed

Comparators with Auto-Standby

________________________________________________________________ Maxim Integrated Products 1

Functional Diagram

19-1141; Rev 2; 2/07

Ordering Information

Pin Configurations appear at end of data sheet.

MAX975

IN+

OUT

GND

STO

HIGH SPEED

LOW POWER

ENABLE

IN-

STAT

TIMING

CIRCUIT

ENABLE

TRANSITION

MONITOR

PART TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX975ESA -40°C to +85°C

8 SO

S8-2

MAX975EUA-T -40°C to +85°C

8 µMAX-8

U8-1

MAX977ESD -40°C to +85°C

14 SO

S14-1

MAX977EEE -40°C to +85°C

16 QSOP

E16-1

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Summary of content (17 pages)

PAGE 1
9-1141; Rev 2; 2/07 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby The MAX975/MAX977 single/dual comparators feature three different operating modes, and are optimized for +3V and +5V single-supply applications. The operating modes are as follows: high speed, high speed with auto-standby, and low power. Propagation delay is 28ns in high-speed mode, while supply current is only 250µA. Supply current is reduced to 3µA in low-power mode.
PAGE 2
MAX975/MAX977 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC) ............................................................+6V All Other Pins..............................................-0.3V to (VCC + 0.3V) Current into Input Pins ......................................................±20mA Duration of Output Short Circuit to GND_ or VCC ......Continuous Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 5.88mW/°C above +70°C).............
PAGE 3
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby (VCC = +2.7V to +5.25V, specifications are for high-speed mode, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP 0.
PAGE 4
MAX975/MAX977 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.25V, specifications are for high-speed mode, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby -0.85 -0.90 -0.95 -1.00 -1.05 -1.10 -1.15 -1.20 0 20 40 60 80 100 LOW-POWER MODE 10 1 0.01k 0.1k 100 -70 VCC = 3V -90 -110 VCC = 5V -130 -170 1k 10k 100k 1M 10M 100M -60 -40 -20 20 40 60 80 100 LOW-POWER INPUT BIAS CURRENT vs. TEMPERATURE HIGH-SPEED VOLTAGE TRIP POINTS/INPUT OFFSET VOLTAGE vs. TEMPERATURE HIGH-SPEED VOLTAGE TRIP POINTS/INPUT OFFSET VOLTAGE vs. TEMPERATURE 5.5 VCC = 5V 5.0 4.5 VCC = 3V 4.0 3.
PAGE 6
____________________________Typical Operating Characteristics (continued) (VCC = 3.0V, TA = +25°C, unless otherwise noted.) OUTPUT HIGH VOLTAGE vs. OUTPUT SOURCE CURRENT 3.0 100 2.0 1.5 VCC = 3V 3.0 OUTPUT VOLTAGE (V) 1000 TA = -40°C 2.5 3.5 MAX977-11 VCC = 3V OUTPUT VOLTAGE (V) 10000 TIMEOUT (µs) 3.5 MAX977-10 100000 OUTPUT LOW VOLTAGE vs. OUTPUT SINK CURRENT TA = +85°C 1.0 MAX977-12 AUTO-STANDBY TIMEOUT vs. TIMEOUT CAPACITOR TA = +25°C TA = +85°C 2.5 2.0 TA = -40°C 1.5 1.0 10 0.
PAGE 7
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby tPD+ tPDVCC = +5V tPD+ 22.5 20.0 17.5 15.0 VCC = +3V 20 tPD+ VCC = +5V 15 10 5 50 100 150 200 250 520 480 440 tPD+ 400 360 tPD- 320 280 200 0 20 40 60 80 100 120 140 160 180 200 CAPACITIVE LOAD (pF) -60 -40 -20 INPUT OVERDRIVE (mV) LOW-POWER PROPAGATION DELAY vs.
PAGE 8
MAX975/MAX977 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby ____________________________Typical Operating Characteristics (continued) (VCC = 3.0V, TA = +25°C, unless otherwise noted.
PAGE 9
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby 100kHz RESPONSE LOW-POWER MODE (VCC = +3V) 100kHz RESPONSE LOW-POWER MODE (VCC = +5V) INPUT 5mV/div VOS INPUT 5mV/div VOS VCC VCC OUTPUT 2V/div OUTPUT 1V/div GND GND MAX975/977 TOC32 2µs/div MAX975/977 TOC31 2µs/div 10MHz RESPONSE HIGH-SPEED MODE (VCC = +5V) INPUT 5mV/div VOS VCC OUTPUT 2V/div GND MAX975/977 TOC34 20ns/div MAX975 AUTO-STANDBY OPERATION 10MHz RESPONSE HIGH-SPEED MODE (VCC = +3V) +100mV INPUT 5mV/div VOS Inp
PAGE 10
MAX975/MAX977 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby _____________________________________________________________Pin Descriptions MAX975 PIN NAME FUNCTION 1 VCC Positive Supply Voltage, +2.7V to +5.25V 2 IN+ Noninverting Comparator Input 3 IN- Inverting Comparator Input 4 STAT Mode Status Pin. Indicates the operating mode. STAT is high for auto-standby mode or low-power mode, and during the transition to high-speed mode.
PAGE 11
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby MAX975/MAX977 Table 1. Programming INPUTS STAT OUTPUT MODE LP STO_ IDLE TIME L tASB = CSTO x 10µs/pF
PAGE 12
MAX975/MAX977 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby tASB DIFFERENTIAL INPUT VOLTAGE OUT_ VOS VOH VCC A VOL tPD+ STAT_ tPWD tPD- tASD VCC 0V ICC (TYP) tLPSH tASCD 300µA 3µA tLPCD tASBE LP tLPE tHSE Figure 2. Timing Diagram powered up, the high-speed comparator is enabled, the low-power comparator is disabled, and STAT goes high, placing the MAX975 back into high-speed mode (Figure 2).
PAGE 13
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby Powering Circuitry with STAT STAT’s function is to indicate the comparator’s operating mode. When STAT is low, the comparator is in highspeed mode and will meet the guaranteed propagation delay. When STAT is high, the comparator is in autostandby mode, in low-power mode, or in transition to high-speed mode. An additional feature of this pin is that it can source 3mA of current. When STAT is high, additional circuitry can be powered.
PAGE 14
MAX975/MAX977 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby VCC R3 VIN 14 82.1kΩ, 1% 4 UNDERVOLTAGE 1/2 MAX977 3 MAX975 R2 24.9kΩ, 1% MAX6120 6 I/0 50Ω CSTO 5 11 OVERVOLTAGE 9 7 R1 100kΩ, 1% µP STO 1/2 MAX977 3 I/0 LP POWER GOOD VCC 2 WAKE-UP IRQ STAT CSTOA 2 1 VCC 1 15 VCC 3V 0.1µF 0.1µF 10 GND X-BAND DETECTOR 3V CSTOB 4.7kΩ 1MΩ 0.1µF (PIN NUMBERS SHOWN ARE FOR QSOP PACKAGE) Figure 5. Window Comparator Figure 6.
PAGE 15
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby TOP VIEW VCC 1 IN+ 2 IN- 3 8 MAX975 STAT 4 LP STOA 1 16 STATA STOA 1 14 STATA GNDA 2 15 INA- GNDA 2 13 INA- OUTA 3 14 INA+ OUTA 3 12 INA+ VCC 4 7 OUT 6 GND VCC 4 5 STO SO/µMAX MAX977 MAX977 13 LP 11 LP VCC 5 12 N.C.
PAGE 16
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 4X S 8 8 INCHES DIM A A1 A2 b E Ø0.50±0.1 H c D e E H 0.6±0.1 L 1 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6° 0° 0.0207 BSC 8LUMAXD.
PAGE 17
Single/Dual, +3V/+5V Dual-Speed Comparators with Auo-Standby QSOP.EPS PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH 21-0055 F 1 1 ___________________Revision History Pages changed at Rev 2: 1, 2, 6, 7, 10, 14–16 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.